I successfully dual booted Ubuntu 20.04 on windows 7. After a month, I removed my windows 7 and since then I started experiencing black screen at boot (without blinking cursor) which I somehow overcome with pressing the shift key or
esc key, etc. My laptop use a
hybrid Intel/AMD graphic card which gave me problems on and off even while I was on windows.
Thinking a fresh install would solve the problem, I reinstalled Ubuntu (only) and encountered
error: unknown filesystem. While trying to fix this, I might have messed somehow that I have the black screen everytime I try to boot, unable to even access the bios (and hence can't even live boot).
It would be great if someone could help me out on this. Thanks in anticipation!